Moving a character into a 2d int array

Hi dear Unity community :)

I learn javascript through Unity for some months now so i sure have some gaps in my knowledge and i'm kind of stuck in my new project. It's a simple 2D tiled puzzle/plateformer. I'm planning to use @Eric5h5 GridMove and from my reading around here I understand the best way to build my game is to use an int array to store my level. Then here is a great example from @Statement found as an answer here : http://answers.unity3d.com/questions/51945/building-a-multidimensional-array-for-grid-movemen.html

 private var width = 10;
 private var height = 10;
 
 private var grid = [
             [1,1,1,1,1,0,1,1,1,1], 
             [1,0,0,0,1,1,1,0,0,1], 
             [1,1,1,0,0,1,0,0,1,1],
             [1,0,1,1,1,1,1,1,1,0], 
             [1,0,0,0,1,0,1,0,1,0], 
             [1,1,1,1,1,0,1,1,1,1], 
             [0,0,1,0,1,1,1,0,0,1], 
             [1,1,1,1,1,0,1,1,0,1], 
             [1,0,0,1,0,0,0,1,0,1], 
             [1,1,1,1,1,1,1,1,1,1]
         ];
 
 private var edges : Edges[,];
 
 @System.Flags
 enum Edges
 {
     None = 0,
     East = 1, 
     North = 2, 
     West = 4, 
     South = 8,
     // Edit: added Edges.All as shortcut for East|North|West|South
     All = 15
 };
 
 // Let's build the edges so we don't need to do a lot of checking.
 BuildEdges();
 
 function BuildEdges()
 {
     edges = new Edges[width, height];
 
     for (var y = 0; y < height; ++y)
     {
         for (var x = 0; x < width; ++x)
         {                
             edges[x, y] = FindEdges(x, y);       
         }
     }
 }
 
 function FindEdges(x : int, y : int) : Edges
 {
     var edge = Edges.None;
 
     if (Grid(x, y - 1) == 1)
         edge |= Edges.North;
     if (Grid(x - 1, y) == 1)
         edge |= Edges.West;
     if (Grid(x + 1, y) == 1)
         edge |= Edges.East;
     if (Grid(x, y + 1) == 1)
         edge |= Edges.South;
 
     return edge;
 }
 
 function Grid(x : int, y : int) : int
 {
     if (x < 0 || x >= width) return 0;
     if (y < 0 || y >= height) return 0;
     return grid[x][y];
 }
 
 // Use Test as such: 
 // if (Test(x, y, Edges.West))
 //    MoveWest();
 
 function Test(x : int, y : int, direction : Edges) : boolean
 {
     if (x < 0 || x >= width) return false;
     if (y < 0 || y >= height) return false;
 
     return (edges[x, y] & direction) == direction;
 }

Here i don't understand the last part "function Test". Is it written just as an example ? Or is it done for specific purpose ? Do I have to write a function Test for each direction to know if my character can move ?

(edit) Another point, I don't get the use of the enum edges numbers.

Then, if i want to add other tiles functions, for example a ladder or a hole one, do I have to store it as a similar way in an new array ?

Sorry if i did something wrong, it's my first question here ^^'